I got a ride out to Lake Murray during lunch at the International Urban Wildife Biology conference -- it was an overcast day, so I didn't get to see quite as many vertebrates or pollinators that I was hoping for... Nonetheless, I still saw some really neat things. :)
This plant is
Low to the ground, Bushy, Herbaceous stem, Many stems, Round stem, Opposite leaves, Thin leaves, Smooth texture, Palmately lobed, The stem is smooth
It is around 2-3 feet high and expansion of 3 miles.